Safety razor blade



June 2, 1931. w, c, ROGERS 1,808,480

SAFETY RAZOR BLADE Filed March 5, 1929 Patented June 2, 1931 UNITED STATES WILLIAM C. ROGERS, OF CHICAGO, ILLINOIS SAFETY RAZOR BLADE Application fllqd March 5, 1929. SerialNo. 344,391.

of the blade in the direction of the widthof the blade; to provide a blade which, while susceptible of cheap manufacture and low market value, is adapted to provide the said desirable results when used in conventional holders; to provide a construction of blade which will positively and easily permit the positioning of the blade in blade holders and give choice of a plurality of shaving effects; and to provide means inherent in a safety razor blade which, in combination with e positioning means in safety razor 'blade holders, shall give two shaving eflects with one clamping of the blade.

The invention as illustrated in the accompanying drawings, consists in a construction and combination of parts of which a preferred embodiment is shown, wherein:

Figure 1 isan end elevation of the head of a conventional safety razor holder, showing the improved blade in position for use,

parts of the handle cut away.

Figure 2 is the plan view of the improved blade, mounted on the base of the conventional holder.

' Figure 3 is a plan view of another form of improved blade, showing the easy adaptation of the invention to other types of blades and holders.

Figures 1 and 2 illustrate the application of the invention to a safety razor blade with twov cutting edges, adapted to be carried in a conventional holder consisting of the base 10 provided on a longitudinal center line with the blade -positioning pins 11 and at the center with the handle attaching screw stud 12 by means of which together with the handle 13 the assembly of the base 10,

guard 14 and blade 15 is effected.

The blade is devised with the pin receiving seats 16, which preferably are of the same size and shape and symmetrically positioned with respect to the straight line H through their centers. The lon itudinal edges 17 of the seats 16 are pre erably parallel to the cutting edges 18 of the blade.

The width of the seats 16 and of the center stud receiving seat 19 exceed the diameters of the pins 11 and stud 12, respectively, by an amount sufiicient to permit the free assage of the pins and stud therethroug The invention purposes a novel positioning of the pin receiving seats, by which novelty the cutting edges will be caused to automatically project with one clamping of the o0 holder at different distances beyond the positioning clamping edges of the base and guard, thus simultaneously providing in combination with the flesh contacting surfaces of the holder a relatively different shaving effect for each shaving edge of the razor. This novelty consists in devising the pin receiving seats 16 so that the edges 17a shall parallel and lie at a greater distance from the cutting edges 18a of the blade than do the edges 17!) of'said seats parallel and lie'from the cutting edge 18?) of the blade. The longitudinal axes of the inherent positioning means'in the blade lie out of the longitudinal axis of the blade. The seat 19 preferably is devised in a positionmidway between and in a line with the seats 16.

It is evident (see Figure 1) that such animproved blade positioned for use in a conventional symmetrical holder will provide automatically a different shaving efiect for each shaving edge. Note the relatively different positions of the two cutting edges with respect to the adjacent flesh contacting surfaces included between the points of tangency of the right lines n-0 and pg, respectively, and to said lines.

In safety razors devised to adjust the position of the blade by screwing the handle in or out the improved blade gives two chances of securing a satisfactory shaving effect; But when the blade is clamped in one abutted position or is positively seated and when shaving effects have been classified by numbers for conventional symmetrical holders as the result of seats systematically positioned with respect to the cutting edges, such seated and classified blade will give exactly the desired shaving result.

The use of such improved blade will supersede the unsatisfactory screw positioned guess work.

Another application of the invention 1s illustrated in Figure 3. In this rectangular blade 20, the inherent positionin means assumes the form of'the ratchet-1i e seats 21. A pair of the seats 21 are shown engaged with the single tooth 22 devised in each upstanding end lug A of the base plate 23. The front edge 24 of the clamping plate of this type of holders is indicated by the broken line. The blade is reversible.

The median plane z-z is drawn in Figs. 2 and 3 to include the longitudinal axes of the blades 15 and 20 respectively. In Fig. 3, the trace of the plane z-z clearly shows the point or center 25 of the pair of center slots 21, one at each end of the blade 20, to lie out of the longitudinal axis contained in that plane, and that the centers of the other slots 21 are shown out of said axis and will continue to so lie when the said other slots in airs are engaged with the teeth 22. And it is readily understood that by remov- The drawin s are merely illustrative and are not inten ed to give exact dimensions. The invention having been described, what is claimed as new and useful is:

l. A safety razor comprising, a blade, a holder therefor, a blade positioning means comprising a plurality of notches in each end of the blade, all of which notches are eccentric with relation to the lon itudinal center line of the blade, the oppose notches on said ends being in alignment, projections, one at each end of the holder, said projections adapted to be received into any two apposed aligned notches on said blade. 2. blade for safety razors provided at each end with a plurality of positioning notches, all of which are eccentr1c with relation to the longitudinal center line of the blade, the opposed notches on said ends being in alignment.

WILLIAM C. ROGERS.

Thus is made possible two adjustments for each pair of slots, a novel refinement of adjustment heretofore not obtainable by means .inherent in a razor blade.

And one other valuable feature of old art is'incidentally secured by this invention,--a

simple method of securing the hollow ground construction back of the cutting edge of the blade, a construction considere va uable in the old fashioned, open bladed razor. How this is done is obvious.

In Fig. 2, the distance separating the line (containing the centers of the positioning pins 11) from the plane 2-2 clearly emphasizes the feature which characterizes this invention. Whether there be one pair of positioning seats 16 as in Fig. 2, or a plurality of pairs of seats as in Fig. 3, the centers of the respective pairs are devised in a line of parallel with buteach said line lying out of the longitudinal axis of the blade, and where there is a plurality of said lines each said line also is devised to lie at a different distance from said axis.

And so while the invention has been fully described as applied to a blade for use in a conventional symmetrical type of holder, and touched upon in a conventional asymmetrical type of holder, it is evident that the invention is readily adaptable to other types of blades in other types of holders, all without materially departing from the spirit of the invention. 

